Patent GB-189706493-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: FARWELL GRANGER
Filed: 1897-03-12
Granted: 1898-03-05
Abstract: 6493. Farwell, G. March 12. Type-writers.-Relates to that class of type-writers in which the type levers are formed as loops arranged in series on each side of the printing-centre. The series diverge towards the platen so as to leave as large a portion of the sheet visible as possible. Each type-lever is provided with a type-block C' containing one or several characters. The levers are connected through links c' to the key levers B by means of a spring attached at one end to the lever and having a bent finger at the other end which passes through a slot in the end of the link. The ends of the link and spring are situated in a slot in the lever. A letter-spacing frame M is pivoted under and passes below all the keys. The frame M operates, by means of lever connections, rigid and limber pawls which move t h e ratchet-wheel L' on the vertical shaft L. The shaft L carries at its upper end a wheel L<1> which gears with the spacing- rack E' on the paper carriage. The frame M also operates the links W<5> connected to the inking- ribbon device W' f o r placing the ribbon over the printing-centre before printing, and removing it as soon as the type has risen again. The paper - carriage support consists of two transverse bars F, F' connected by a frame F<1> provided with a guide-rod F<3> by which it is moved backwards or forwards so as to cause the various sets of type on the type levers to strike at the printing-centre. The frame F' is provided with a coiled spring K<1> by which the printing- carriage is returned to its initial position. The shaft L is so mounted that it can move backwards or forwards with the frame F<1> to maintain the wheel L' in contact with the rack E<2> in all positions, and at the same time allows them to be separated by the slide Q<1> when it is desired to return the paper carriage to its initial position from any intermediate point. The paper carriage runs on the rods F, F<1> by means of rollers E<4>, H. The platen cylinder is carried between end supports E', and is provided with adjustable presser rolls for guiding the paper. The guides on the top of the platen are in the form of tapering spring fingers mounted on an angular shaft. A toothed scale is attached to the lower part of the carriage, and is provided with an adjustable stop carrying a projection for tripping a bell lever so as to sound an alarm at the required position. An adjustable stop bar is attached to the frame F' by which the paper carriage is released and allowed to return to its normal position, at the same time causing the line-spacing mechanism to come into action. The platen spindle is provided with a friction-grip ratchet-wheel with a locking-pawl capable of being set in its locked or unlocked position. This wheel can be turned by means of a thumb piece. Automatic line-spacing is obtained by a bevel-wheel capable of being locked to or unlocked from the shaft and operated upon by a pivoted tooth sector, the head of which is provided with a runner for engagement with a bevelled piece set on the frame F<1>. An adjustable stop is provided for varying the throw of the sector so as to obtain various line spaces. The printing takes place through an inking-ribbon each end of which is attached to a shaft contained in a fixed case. Each case is provided with suitable guides, and the ribbon is fed between the two through the reciprocating guides W. The ribbon shafts extend downwards, and terminate in bevel-wheels, either one of which can engage with a bevel-wheel on the end of the shaft V<5>. The shaft V<5> can be moved longitudinally by the lever P', to throw either wheel into engagement, and is rotated by means of the worm-wheel V<9> and worm V<10>. The worm V<10> is operated by a ratchet-wheel v<10> having driving-pawls v<11> which are oscillated by an extension from the spacing-frame M.